Malicious PDF — malware analysis report

Static analysis result for SHA-256 611782c888597491…

MALICIOUS

PDF

43.4 KB Created: 2020-11-07 03:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 04d9ff395cb1dc414039d29cac86ffc9 SHA-1: d20522c7c79e66ec167ea59669502f75846d0f3e SHA-256: 611782c8885974916ad1c9437f7ed6c4750813bdcd85c4c73b8796f1aa6c7aaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?keyword=gossip+girl+season+5+episode+13 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f9be5d1520cb.pdfIn PDF document text
    • https://tejelodaburibav.weebly.com/uploads/1/3/4/3/134317360/lowuwatawefavozi.pdfIn PDF document text
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/labifeloniduwobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f8dd1af3cb0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/schwinn_airdyne_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caae88a2-aa25-4ac4-9a87-2d013615dc2c/41880158940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98510598-6951-4f4f-b2bb-9bc3ff510584/43623868654.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a622871-c065-4fe5-83a9-8bab752ca7b9/hp_fax_receive_testing_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92000035-1753-42f0-ac4c-f149e2baa523/ecosystem_worksheet_9th_grade.pdfIn PDF document text
    • https://tumitom.files.wordpress.com/2020/11/nutaxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719acc14-cbf4-4458-ac43-e26800b66f97/dalujelajujapejirisumurop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84b1139-5886-40e1-9831-5d75a034d4ba/86229629614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60af7930-2ff1-48a1-80bc-f053b252ab4b/gee_handbook_of_discourse_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea9a3c9-e59c-43fb-b97e-8bbef9badc6e/29558772463.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/negative_exponents_notes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DA 5500 bytes
SHA-256: 49ea2a4ffaa5ca9523ea288d4af8805e8b55f4f43257fbe087d06ddcdb24d0f4
font_01_sfnt_off00007ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA6 10700 bytes
SHA-256: 6c5b18118e82c58275402f8d02322967d49c8d7fa3e50fc2a52f1961037ad859